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Goodwill (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Goodwill [Roll Forward]    
Opening balance $ 936,257,000 $ 883,170,000
Current period acquisitions (Note 7) 8,013,878,000 27,191,000
Prior period acquisitions 0 123,000
Foreign exchange movement (14,923,000) 25,773,000
Closing balance 8,935,212,000 936,257,000
Accumulated impairment loss $ 0 $ 0